The payload of an SCTP DATA chunk is *not* necessarily ASCII text, so it

[tcpdump] / print-ip.c

diff --git a/print-ip.c b/print-ip.c
index 2951875ee970c90f6b778887172671c48f3abc86..c14d2fc2977bdedfb5a39166fbd23261cbe2b74f 100644 (file)
--- a/print-ip.c
+++ b/print-ip.c
@@ -1,7 +1,5 @@
-/*     $NetBSD: print-ip.c,v 1.4 1995/04/24 13:27:43 cgd Exp $ */
-

 /*
 /*

- * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
+ * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997

  *     The Regents of the University of California.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  *     The Regents of the University of California.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without


@@ -23,82 +21,44 @@
 
 #ifndef lint
 static const char rcsid[] =
 
 #ifndef lint
 static const char rcsid[] =

-    "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.68 1999-10-17 21:56:54 mcr Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.102 2001-11-16 02:17:36 itojun Exp $ (LBL)";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"

 #endif
 
 #include <sys/param.h>
 #include <sys/time.h>
 #endif
 
 #include <sys/param.h>
 #include <sys/time.h>

-#include <sys/types.h>

 #include <sys/socket.h>
 
 #include <netinet/in.h>
 #include <sys/socket.h>
 
 #include <netinet/in.h>

-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/udp.h>
-#include <netinet/tcp.h>

 
 

+#include <netdb.h>

 #include <stdio.h>
 #include <stdio.h>

-#ifdef __STDC__

 #include <stdlib.h>
 #include <stdlib.h>

-#endif
+#include <string.h>

 #include <unistd.h>
 
 #include <unistd.h>
 

-#include "interface.h"

 #include "addrtoname.h"
 #include "addrtoname.h"

+#include "interface.h"
+#include "extract.h"                   /* must come after interface.h */

 
 

-static void
-igmp_print(register const u_char *bp, register int len,
-          register const u_char *bp2)
-{
-       register const struct ip *ip;
-       register const u_char *ep;
-
-       ip = (const struct ip *)bp2;
-       ep = (const u_char *)snapend;
-        (void)printf("%s > %s: ",
-               ipaddr_string(&ip->ip_src),
-               ipaddr_string(&ip->ip_dst));
+#include "ip.h"

 
 

-       if (bp + 7 > ep) {
-               (void)printf("[|igmp]");
-               return;
-       }
-       switch (bp[0] & 0xf) {
-       case 1:
-               (void)printf("igmp query");
-               if (*(int *)&bp[4])
-                       (void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
-               if (len != 8)
-                       (void)printf(" [len %d]", len);
-               break;
-       case 2:
-               (void)printf("igmp report %s", ipaddr_string(&bp[4]));
-               if (len != 8)
-                       (void)printf(" [len %d]", len);
-               break;
-       case 3:
-               (void)printf("igmp dvmrp %s", ipaddr_string(&bp[4]));
-               if (len < 8)
-                       (void)printf(" [len %d]", len);
-               break;
-       default:
-               (void)printf("igmp-%d", bp[0] & 0xf);
-               break;
-       }
-       if ((bp[0] >> 4) != 1)
-               (void)printf(" [v%d]", bp[0] >> 4);
-       if (bp[1])
-               (void)printf(" [b1=0x%x]", bp[1]);
-}
+/* Compatibility */
+#ifndef        IPPROTO_ND
+#define        IPPROTO_ND      77
+#endif

 
 /*
  * print the recorded route in an IP RR, LSRR or SSRR option.
  */
 static void
 
 /*
  * print the recorded route in an IP RR, LSRR or SSRR option.
  */
 static void

-ip_printroute(const char *type, register const u_char *cp, int length)
+ip_printroute(const char *type, register const u_char *cp, u_int length)

 {
 {

-       int ptr = cp[2] - 1;
-       int len;
+       register u_int ptr = cp[2] - 1;
+       register u_int len;

 
        printf(" %s{", type);
        if ((length + 1) & 3)
 
        printf(" %s{", type);
        if ((length + 1) & 3)


@@ -110,32 +70,92 @@ ip_printroute(const char *type, register const u_char *cp, int length)
        for (len = 3; len < length; len += 4) {
                if (ptr == len)
                        type = "#";
        for (len = 3; len < length; len += 4) {
                if (ptr == len)
                        type = "#";

-#ifdef TCPDUMP_ALIGN
-               {
-               struct in_addr addr;
-               bcopy((char *)&cp[len], (char *)&addr, sizeof(addr));
-               printf("%s%s", type, ipaddr_string(&addr));
-               }
-#else

                printf("%s%s", type, ipaddr_string(&cp[len]));
                printf("%s%s", type, ipaddr_string(&cp[len]));

-#endif

                type = " ";
        }
        printf("%s}", ptr == len? "#" : "");
 }
 
                type = " ";
        }
        printf("%s}", ptr == len? "#" : "");
 }
 

+static void
+ip_printts(register const u_char *cp, u_int length)
+{
+       register u_int ptr = cp[2] - 1;
+       register u_int len = 0;
+       int hoplen;
+       char *type;
+
+       printf(" TS{");
+       hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
+       if ((length - 4) & (hoplen-1))
+               printf("[bad length %d]", length);
+       if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
+               printf("[bad ptr %d]", cp[2]);
+       switch (cp[3]&0xF) {
+       case IPOPT_TS_TSONLY:
+               printf("TSONLY");
+               break;
+       case IPOPT_TS_TSANDADDR:
+               printf("TS+ADDR");
+               break;
+       /*
+        * prespecified should really be 3, but some ones might send 2
+        * instead, and the IPOPT_TS_PRESPEC constant can apparently
+        * have both values, so we have to hard-code it here.
+        */
+
+       case 2:
+               printf("PRESPEC2.0");
+               break;
+       case 3:                 /* IPOPT_TS_PRESPEC */
+               printf("PRESPEC");
+               break;
+       default:        
+               printf("[bad ts type %d]", cp[3]&0xF);
+               goto done;
+       }
+
+       type = " ";
+       for (len = 4; len < length; len += hoplen) {
+               if (ptr == len)
+                       type = " ^ ";
+               printf("%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
+                      hoplen!=8 ? "" : ipaddr_string(&cp[len]));
+               type = " ";
+       }
+
+done:
+       printf("%s", ptr == len ? " ^ " : "");
+
+       if (cp[3]>>4)
+               printf(" [%d hops not recorded]} ", cp[3]>>4);
+       else
+               printf("}");
+}
+

 /*
  * print IP options.
  */
 static void
 /*
  * print IP options.
  */
 static void

-ip_optprint(register const u_char *cp, int length)
+ip_optprint(register const u_char *cp, u_int length)

 {
 {

-       int len;
+       register u_int len;

 
        for (; length > 0; cp += len, length -= len) {
                int tt = *cp;
 
 
        for (; length > 0; cp += len, length -= len) {
                int tt = *cp;
 

-               len = (tt == IPOPT_NOP || tt == IPOPT_EOL) ? 1 : cp[1];
+               if (tt == IPOPT_NOP || tt == IPOPT_EOL)
+                       len = 1;
+               else {
+                       if (&cp[1] >= snapend) {
+                               printf("[|ip]");
+                               return;
+                       }
+                       len = cp[1];
+               }
+               if (len <= 0) {
+                       printf("[|ip op len %d]", len);
+                       return;
+               }

                if (&cp[1] >= snapend || cp + len > snapend) {
                        printf("[|ip]");
                        return;
                if (&cp[1] >= snapend || cp + len > snapend) {
                        printf("[|ip]");
                        return;


@@ -153,15 +173,17 @@ ip_optprint(register const u_char *cp, int length)
                        break;
 
                case IPOPT_TS:
                        break;
 
                case IPOPT_TS:

-                       printf(" TS{%d}", len);
+                       ip_printts(cp, len);

                        break;
 
                        break;
 

+#ifndef IPOPT_SECURITY
+#define IPOPT_SECURITY 130
+#endif /* IPOPT_SECURITY */

                case IPOPT_SECURITY:
                        printf(" SECURITY{%d}", len);
                        break;
 
                case IPOPT_RR:
                case IPOPT_SECURITY:
                        printf(" SECURITY{%d}", len);
                        break;
 
                case IPOPT_RR:

-                       printf(" RR{%d}=", len);

                        ip_printroute("RR", cp, len);
                        break;
 
                        ip_printroute("RR", cp, len);
                        break;
 


@@ -173,6 +195,17 @@ ip_optprint(register const u_char *cp, int length)
                        ip_printroute("LSRR", cp, len);
                        break;
 
                        ip_printroute("LSRR", cp, len);
                        break;
 

+#ifndef IPOPT_RA
+#define IPOPT_RA 148           /* router alert */
+#endif
+               case IPOPT_RA:
+                       printf(" RA");
+                       if (len != 4)
+                               printf("{%d}", len);
+                       else if (cp[2] || cp[3])
+                               printf("%d.%d", cp[2], cp[3]);
+                       break;
+

                default:
                        printf(" IPOPT-%d{%d}", cp[0], len);
                        break;
                default:
                        printf(" IPOPT-%d{%d}", cp[0], len);
                        break;


@@ -184,126 +217,72 @@ ip_optprint(register const u_char *cp, int length)
  * compute an IP header checksum.
  * don't modifiy the packet.
  */
  * compute an IP header checksum.
  * don't modifiy the packet.
  */

-static int
-in_cksum(const struct ip *ip)
+u_short
+in_cksum(const u_short *addr, register u_int len, int csum)

 {
 {

-       register const u_short *sp = (u_short *)ip;
-       register u_int32 sum = 0;
-       register int count;
+       int nleft = len;
+       const u_short *w = addr;
+       u_short answer;
+       int sum = csum;
+
+       /*
+        *  Our algorithm is simple, using a 32 bit accumulator (sum),
+        *  we add sequential 16 bit words to it, and at the end, fold
+        *  back all the carry bits from the top 16 bits into the lower
+        *  16 bits.
+        */
+       while (nleft > 1)  {
+               sum += *w++;
+               nleft -= 2;
+       }
+       if (nleft == 1)
+               sum += htons(*(u_char *)w<<8);

 
        /*
 
        /*

-        * No need for endian conversions.
+        * add back carry outs from top 16 bits to low 16 bits

         */
         */

-       for (count = ip->ip_hl * 2; --count >= 0; )
-               sum += *sp++;
-       while (sum > 0xffff)
-               sum = (sum & 0xffff) + (sum >> 16);
-       sum = ~sum & 0xffff;
-
-       return (sum);
-}
-
-
-void
-print_ipproto(u_int proto, const struct ip *ip,
-             const u_char *cp,  int len)
-{
-  switch (proto) {
-  case IPPROTO_TCP:
-    tcp_print(cp, len, (const u_char *)ip);
-    break;
-  case IPPROTO_UDP:
-    udp_print(cp, len, (const u_char *)ip);
-    break;
-  case IPPROTO_ICMP:
-    icmp_print(cp, (const u_char *)ip);
-    break;
-  case IPPROTO_ND:
-    (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
-                ipaddr_string(&ip->ip_dst));
-    (void)printf(" nd %d", len);
-    break;
-  case IPPROTO_EGP:
-    egp_print(cp, len, (const u_char *)ip);
-    break;
-#ifndef IPPROTO_OSPF
-#define IPPROTO_OSPF 89
-#endif
-  case IPPROTO_OSPF:
-    ospf_print(cp, len, (const u_char *)ip);
-    break;
-#ifndef IPPROTO_IGMP
-#define IPPROTO_IGMP 2
-#endif
-  case IPPROTO_IGMP:
-    igmp_print(cp, len, (const u_char *)ip);
-    break;
-#ifndef IPPROTO_ENCAP
-#define IPPROTO_ENCAP 4
-#endif
-  case IPPROTO_ENCAP:
-    /* ip-in-ip encapsulation */
-    if (vflag)
-      (void)printf("%s > %s: ",
-                  ipaddr_string(&ip->ip_src),
-                  ipaddr_string(&ip->ip_dst));
-    ip_print(cp, len);
-    if (! vflag) {
-      printf(" (encap)");
-      return;
-    }
-    break;
-
-#ifndef IPPROTO_ESP
-#define IPPROTO_ESP 50
-#endif
-  case IPPROTO_ESP:
-    esp_print(cp, len, (const u_char *)ip);
-    break;
-
-#ifndef IPPROTO_AH
-#define IPPROTO_AH  51
-#endif
-  case IPPROTO_AH:
-    ah_print(cp, len, (const u_char *)ip);
-    break;
-    
-  default:
-    (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
-                ipaddr_string(&ip->ip_dst));
-    (void)printf(" ip-proto-%d %d", proto, len);
-    break;
-  }
+       sum = (sum >> 16) + (sum & 0xffff);     /* add hi 16 to low 16 */
+       sum += (sum >> 16);                     /* add carry */
+       answer = ~sum;                          /* truncate to 16 bits */
+       return (answer);

 }
 
 /*
  * print an IP datagram.
  */
 void
 }
 
 /*
  * print an IP datagram.
  */
 void

-ip_print(register const u_char *bp, register int length)
+ip_print(register const u_char *bp, register u_int length)

 {
        register const struct ip *ip;
 {
        register const struct ip *ip;

-       register int hlen;
-       register int len;
-       register int off;
+       register u_int hlen, len, len0, off;

        register const u_char *cp;
        register const u_char *cp;

+       u_char nh;
+       int advance;
+       struct protoent *proto;

 
        ip = (const struct ip *)bp;
 
        ip = (const struct ip *)bp;

-#ifdef TCPDUMP_ALIGN
+#ifdef LBL_ALIGN

        /*
        /*

-        * The IP header is not word aligned, so copy into abuf.
-        * This will never happen with BPF.  It does happen raw packet
-        * dumps from -r.
+        * If the IP header is not aligned, copy into abuf.

         */
         */

-       if ((long)ip & (sizeof(long)-1)) {
-               static u_char *abuf;
+       if ((long)ip & 3) {
+               static u_char *abuf = NULL;
+               static int didwarn = 0;

 
 

-               if (abuf == 0)
+               if (abuf == NULL) {

                        abuf = (u_char *)malloc(snaplen);
                        abuf = (u_char *)malloc(snaplen);

-               bcopy((char *)ip, (char *)abuf, min(length, snaplen));
+                       if (abuf == NULL)
+                               error("ip_print: malloc");
+               }
+               memcpy((char *)abuf, (char *)ip, min(length, snaplen));

                snapend += abuf - (u_char *)ip;
                packetp = abuf;
                ip = (struct ip *)abuf;
                snapend += abuf - (u_char *)ip;
                packetp = abuf;
                ip = (struct ip *)abuf;

+               /* We really want libpcap to give us aligned packets */
+               if (!didwarn) {
+                       warning("compensating for unaligned libpcap packets");
+                       ++didwarn;
+               }

        }
 #endif
        if ((u_char *)(ip + 1) > snapend) {
        }
 #endif
        if ((u_char *)(ip + 1) > snapend) {


@@ -314,13 +293,18 @@ ip_print(register const u_char *bp, register int length)
                (void)printf("truncated-ip %d", length);
                return;
        }
                (void)printf("truncated-ip %d", length);
                return;
        }

-       hlen = ip->ip_hl * 4;
+       hlen = IP_HL(ip) * 4;
+       if (hlen < sizeof (struct ip)) {
+               (void)printf("bad-hlen %d", hlen);
+               return;
+       }

 
        len = ntohs(ip->ip_len);
        if (length < len)
 
        len = ntohs(ip->ip_len);
        if (length < len)

-               (void)printf("truncated-ip - %d bytes missing!",
+               (void)printf("truncated-ip - %d bytes missing! ",

                        len - length);
        len -= hlen;
                        len - length);
        len -= hlen;

+       len0 = len;

 
        /*
         * If this is fragment zero, hand it to the next higher
 
        /*
         * If this is fragment zero, hand it to the next higher


@@ -329,29 +313,219 @@ ip_print(register const u_char *bp, register int length)
        off = ntohs(ip->ip_off);
        if ((off & 0x1fff) == 0) {
                cp = (const u_char *)ip + hlen;
        off = ntohs(ip->ip_off);
        if ((off & 0x1fff) == 0) {
                cp = (const u_char *)ip + hlen;

-               print_ipproto(ip->ip_p, ip, cp, len);
+               nh = ip->ip_p;
+
+#ifndef IPPROTO_SCTP
+#define IPPROTO_SCTP 132
+#endif
+               if (nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
+                   nh != IPPROTO_SCTP) {
+                       (void)printf("%s > %s: ", ipaddr_string(&ip->ip_src),
+                               ipaddr_string(&ip->ip_dst));
+               }
+again:
+               switch (nh) {
+
+#ifndef IPPROTO_AH
+#define IPPROTO_AH     51
+#endif
+               case IPPROTO_AH:
+                       nh = *cp;
+                       advance = ah_print(cp, (const u_char *)ip);
+                       cp += advance;
+                       len -= advance;
+                       goto again;
+
+#ifndef IPPROTO_ESP
+#define IPPROTO_ESP    50
+#endif
+               case IPPROTO_ESP:
+                   {
+                       int enh, padlen;
+                       advance = esp_print(cp, (const u_char *)ip, &enh, &padlen);
+                       cp += advance;
+                       len -= advance + padlen;
+                       if (enh < 0)
+                               break;
+                       nh = enh & 0xff;
+                       goto again;
+                   }
+
+#ifndef IPPROTO_IPCOMP
+#define IPPROTO_IPCOMP 108
+#endif
+               case IPPROTO_IPCOMP:
+                   {
+                       int enh;
+                       advance = ipcomp_print(cp, (const u_char *)ip, &enh);
+                       cp += advance;
+                       len -= advance;
+                       if (enh < 0)
+                               break;
+                       nh = enh & 0xff;
+                       goto again;
+                   }
+
+               case IPPROTO_SCTP:
+                       sctp_print(cp, (const u_char *)ip, len);
+                       break;
+
+               case IPPROTO_TCP:
+                       tcp_print(cp, len, (const u_char *)ip, (off &~ 0x6000));
+                       break;
+
+               case IPPROTO_UDP:
+                       udp_print(cp, len, (const u_char *)ip, (off &~ 0x6000));
+                       break;
+
+               case IPPROTO_ICMP:
+                       icmp_print(cp, len, (const u_char *)ip);
+                       break;
+
+#ifndef IPPROTO_IGRP
+#define IPPROTO_IGRP 9
+#endif
+               case IPPROTO_IGRP:
+                       igrp_print(cp, len, (const u_char *)ip);
+                       break;
+
+               case IPPROTO_ND:
+                       (void)printf(" nd %d", len);
+                       break;
+
+               case IPPROTO_EGP:
+                       egp_print(cp, len, (const u_char *)ip);
+                       break;
+
+#ifndef IPPROTO_OSPF
+#define IPPROTO_OSPF 89
+#endif
+               case IPPROTO_OSPF:
+                       ospf_print(cp, len, (const u_char *)ip);
+                       break;
+
+#ifndef IPPROTO_IGMP
+#define IPPROTO_IGMP 2
+#endif
+               case IPPROTO_IGMP:
+                       igmp_print(cp, len);
+                       break;
+
+               case 4:
+                       /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
+                       ip_print(cp, len);
+                       if (! vflag) {
+                               printf(" (ipip-proto-4)");
+                               return;
+                       }
+                       break;
+
+#ifdef INET6
+#ifndef IP6PROTO_ENCAP
+#define IP6PROTO_ENCAP 41
+#endif
+               case IP6PROTO_ENCAP:
+                       /* ip6-in-ip encapsulation */
+                       ip6_print(cp, len);
+                       break;
+#endif /*INET6*/
+
+
+#ifndef IPPROTO_GRE
+#define IPPROTO_GRE 47
+#endif
+               case IPPROTO_GRE:
+                       /* do it */
+                       gre_print(cp, len);
+                       break;
+
+#ifndef IPPROTO_MOBILE
+#define IPPROTO_MOBILE 55
+#endif
+               case IPPROTO_MOBILE:
+                       mobile_print(cp, len);
+                       break;
+
+#ifndef IPPROTO_PIM
+#define IPPROTO_PIM    103
+#endif
+               case IPPROTO_PIM:
+                       pim_print(cp, len);
+                       break;
+
+#ifndef IPPROTO_VRRP
+#define IPPROTO_VRRP   112
+#endif
+               case IPPROTO_VRRP:
+                       vrrp_print(cp, len, ip->ip_ttl);
+                       break;
+
+               default:
+                       if ((proto = getprotobynumber(nh)) != NULL)
+                               (void)printf(" %s", proto->p_name);
+                       else
+                               (void)printf(" ip-proto-%d", nh);
+                       printf(" %d", len);
+                       break;
+               }

        }
        }

+
+       /* Ultra quiet now means that all this stuff should be suppressed */
+       /* res 3-Nov-98 */
+       if (qflag > 1) return;
+
+

        /*
         * for fragmented datagrams, print id:size@offset.  On all
         * but the last stick a "+".  For unfragmented datagrams, note
         * the don't fragment flag.
         */
        /*
         * for fragmented datagrams, print id:size@offset.  On all
         * but the last stick a "+".  For unfragmented datagrams, note
         * the don't fragment flag.
         */

+       len = len0;     /* get the original length */

        if (off & 0x3fff) {
                /*
                 * if this isn't the first frag, we're missing the
        if (off & 0x3fff) {
                /*
                 * if this isn't the first frag, we're missing the

-                * next level protocol header.  print the ip addr.
+                * next level protocol header.  print the ip addr
+                * and the protocol.

                 */
                 */

-               if (off & 0x1fff)
+               if (off & 0x1fff) {

                        (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
                                      ipaddr_string(&ip->ip_dst));
                        (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
                                      ipaddr_string(&ip->ip_dst));

-               (void)printf(" (frag %d:%d@%d%s)", ntohs(ip->ip_id), len,
+                       if ((proto = getprotobynumber(ip->ip_p)) != NULL)
+                               (void)printf(" %s", proto->p_name);
+                       else
+                               (void)printf(" ip-proto-%d", ip->ip_p);
+               }
+#ifndef IP_MF
+#define IP_MF 0x2000
+#endif /* IP_MF */
+#ifndef IP_DF
+#define IP_DF 0x4000
+#endif /* IP_DF */
+               (void)printf(" (frag %d:%u@%d%s)", ntohs(ip->ip_id), len,

                        (off & 0x1fff) * 8,
                        (off & IP_MF)? "+" : "");
                        (off & 0x1fff) * 8,
                        (off & IP_MF)? "+" : "");

+

        } else if (off & IP_DF)
                (void)printf(" (DF)");
 
        } else if (off & IP_DF)
                (void)printf(" (DF)");
 

-       if (ip->ip_tos)
-               (void)printf(" [tos 0x%x]", (int)ip->ip_tos);
+       if (ip->ip_tos) {
+               (void)printf(" [tos 0x%x", (int)ip->ip_tos);
+               /* ECN bits */
+               if (ip->ip_tos & 0x03) {
+                       switch (ip->ip_tos & 0x03) {
+                       case 1:
+                               (void)printf(",ECT(1)");
+                               break;
+                       case 2:
+                               (void)printf(",ECT(0)");
+                               break;
+                       case 3:
+                               (void)printf(",CE");
+                       }
+               }
+               (void)printf("] ");
+       }
+

        if (ip->ip_ttl <= 1)
                (void)printf(" [ttl %d]", (int)ip->ip_ttl);
 
        if (ip->ip_ttl <= 1)
                (void)printf(" [ttl %d]", (int)ip->ip_ttl);
 


@@ -368,11 +542,15 @@ ip_print(register const u_char *bp, register int length)
                        (void)printf("%sid %d", sep, (int)ntohs(ip->ip_id));
                        sep = ", ";
                }
                        (void)printf("%sid %d", sep, (int)ntohs(ip->ip_id));
                        sep = ", ";
                }

-               sum = in_cksum(ip);
-               if (sum != 0) {
-                       (void)printf("%sbad cksum %x!", sep,
-                                    ntohs(ip->ip_sum));
-                       sep = ", ";
+               (void)printf("%slen %d", sep, (int)ntohs(ip->ip_len));
+               sep = ", ";
+               if ((u_char *)ip + hlen <= snapend) {
+                       sum = in_cksum((const u_short *)ip, hlen, 0);
+                       if (sum != 0) {
+                               (void)printf("%sbad cksum %x!", sep,
+                                            ntohs(ip->ip_sum));
+                               sep = ", ";
+                       }

                }
                if ((hlen -= sizeof(struct ip)) > 0) {
                        (void)printf("%soptlen=%d", sep, hlen);
                }
                if ((hlen -= sizeof(struct ip)) > 0) {
                        (void)printf("%soptlen=%d", sep, hlen);


@@ -381,3 +559,29 @@ ip_print(register const u_char *bp, register int length)
                printf(")");
        }
 }
                printf(")");
        }
 }

+
+void
+ipN_print(register const u_char *bp, register u_int length)
+{
+       struct ip *ip, hdr;
+
+       ip = (struct ip *)bp;
+       if (length < 4) {
+               (void)printf("truncated-ip %d", length);
+               return;
+       }
+       memcpy (&hdr, (char *)ip, 4);
+       switch (IP_V(&hdr)) {
+       case 4:
+               ip_print (bp, length);
+               return;
+#ifdef INET6
+       case 6:
+               ip6_print (bp, length);
+               return;
+#endif
+       default:
+               (void)printf("unknown ip %d", IP_V(&hdr));
+               return;
+       }
+}